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These are project-wide pagetrees: @racket[articles-pagetree] contains a pagenode for every Pollen
document contained in @racket[articles-path], and @racket[series-pagetree] contains a pagenode for
every Pollen document in @racket[series-path]. The pagenodes themselves point to the rendered
@tt{.html} targets of the source documents.
@section{Metas and @code{txexpr}s}
@defproc[(attr-present? [name symbol?] [attrs (listof pair?)]) boolean?]
Shortsightedly redundant to @code{attrs-have-key?}. Returns @code{#t} if @racket[_name] is one of
the attributes present in @racket[_attrs], otherwise returns @code{#f}.
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